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Benthic-pelagic coupling as a functi...

Fields, Lindsey.

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Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems./
Author:	Fields, Lindsey.
Description:	318 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
Subject:	Biology, Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3595177
ISBN:	9781303402395

Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems.
Fields, Lindsey.

Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems. - 318 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--University of Rhode Island, 2013.

Benthic-pelagic coupling links the sediments and the water column in shallow coastal marine ecosystems. Measurements of benthic-pelagic coupling have been made for decades in shallow, estuarine ecosystems, but relatively few measurements have been made in transitional inner continental shelf areas. Accordingly, the Providence River Estuary and mid-Narragansett Bay have many measurements while ecosystems on the Southern New England inner continental shelf have few.

ISBN: 9781303402395Subjects--Topical Terms:

783691
Biology, Oceanography.

Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems.
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020 $a 9781303402395
035 $a (MiAaPQ)AAI3595177
035 $a AAI3595177
040 $a MiAaPQ $c MiAaPQ
100 1 $a Fields, Lindsey. $3 2101456
245 1 0 $a Benthic-pelagic coupling as a function of changing organic inputs in coastal ecosystems.
300 $a 318 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
500 $a Advisers: Robinson W. Fulweiler; Candace Oviatt.
502 $a Thesis (Ph.D.)--University of Rhode Island, 2013.
520 $a Benthic-pelagic coupling links the sediments and the water column in shallow coastal marine ecosystems. Measurements of benthic-pelagic coupling have been made for decades in shallow, estuarine ecosystems, but relatively few measurements have been made in transitional inner continental shelf areas. Accordingly, the Providence River Estuary and mid-Narragansett Bay have many measurements while ecosystems on the Southern New England inner continental shelf have few.
520 $a I measured benthic fluxes of oxygen, and dissolved inorganic nutrients across two annual cycles in these areas to (1) determine if mid-Bay sediments have responded to the recent return of the traditional winter-spring diatom bloom, and (2) compare benthic-pelagic coupling in two stations at different locations on a north-south gradient of anthropogenic impacts. In the mid-Bay, I measured substantial increases in regeneration of ammonium (176%) and phosphate (266%) regeneration compared to rates measured in 2005-2006, and a significant relationship between surface water phytoplankton biomass and sediment oxygen demand (R2=0.23, p=0.02). Even though these changes occurred concurrently with the recent return of the winter-spring phytoplankton bloom, the lack of difference in sediment oxygen demand over time indicated either a lack of rapid response or loss of organic matter through water column consumption. Despite strong gradients in some of the drivers of benthic mineralization such as organic matter (phytoplankton biomass) and primary production, I found no significant differences in average benthic nutrient fluxes between the Providence River Estuary and the mid-Bay. This may be due to the export of organic material down-bay before an excess amount can fall to the benthos.
520 $a Block Island Sound (BIS) and Rhode Island Sound (RIS) are adjacent, phytoplankton-based ecosystems on the inner continental shelf off Southern New England with contrasting hydrographic regimes. The water column of Block Island Sound is more well mixed as a result of year-round energetic tidal mixing, while Rhode Island Sound typically becomes stratified during the summer. I aimed to examine the effect of hydrography on benthic-pelagic coupling in transitional shelf areas. To address these goals, I measured parameters in both the water column and the benthos. I compared annual cycles of surface chlorophyll a and 14C-measured primary production between these two ecosystems using samples collected over 22 months (chlorophyll) and approximately monthly for 12 months (production). In the benthos, I made the first measurements of biogeochemical fluxes of oxygen and inorganic nutrients at the sediment-water interface in Block Island and Rhode Island Sounds.
520 $a I hypothesized that seasonal water column stratification in Rhode Island Sound would result in increased summer nutrient limitation, lower primary production, and reduced biogeochemical exchanges at the sediment-water interface compared to the relatively more well-mixed Block Island Sound, and that stratification would ultimately weaken the link between the benthos and the water column. In situ measurements of surface chlorophyll a in Block Island Sound and Rhode Island Sound revealed no significant differences in chlorophyll concentrations between the regions.
520 $a Despite the higher rate of euphotic zone primary production in Block Island Sound, benthic metabolism (measured as sediment oxygen demand) was not significantly different between the two areas. This lack of differences was likely due to differences in water column hydrography between the sounds, where the energetic water column mixing in Block Island Sound resuspended organic matter back to the water column to be decomposed before reaching the benthos. Additionally, the seasonal presence of a strong pycnocline in Rhode Island Sound likely prevented mixing of regenerated DIN and DIP to surface waters for use by phytoplankton. Apparent differences in benthic macrofaunal communities between Block Island Sound and Rhode Island Sound translated to differences in dissolved inorganic nutrient fluxes between the two areas, despite the similarities in benthic metabolism. (Abstract shortened by UMI.).
590 $a School code: 0186.
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Ecology. $3 1017726
690 $a 0416
690 $a 0425
690 $a 0329
710 2 $a University of Rhode Island. $b Oceanography. $3 2101394
773 0 $t Dissertation Abstracts International $g 75-01B(E).
790 $a 0186
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3595177